作一線段等於已知線段

作一線段等於已知線段(to co nstruct a seg-ment which equals the given segment)亦稱遷線作圖.基本作圖題(作圖成法)之一具體表述為:已知線段—a。

作一線段等於已知線段(to co nstruct a seg-ment which equals the given segment)亦稱遷線作圖.基本作圖題(作圖成法)之一具體表述為:已知線段—a，求作線段AB，使AB=a.

其具體作法是:

1.作射線AC ;

2.在射線AC上截取AB=a，則線段AB為所求線段.